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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash:    
Interest paid, net of capitalized interest [1] $ 315.9 $ 228.4
Income taxes (received), net of payments (44.4) 0.3
Non-cash investing activities:    
Transfers from materials and supplies inventory to property, plant and equipment 1.9 21.7
Non-cash financing activities:    
Changes in accrued distributions to noncontrolling interests 3.9 73.8
Retained Earnings [Member]    
Non-cash investing activities:    
Impact of capital expenditure accruals on property, plant and equipment, net $ (194.7) $ (150.9)
[1] Interest capitalized on major projects was $31.1 million and $50.5 million for the nine months ended September 30, 2020 and 2019.